The Brazilian Chemical Industry - Challenges and Opportunities
Juliane Elisa Welke; Cláudia Alcaraz ZiniHow to cite this article
GC × GC color plot of a Brazilian base wine obtained with a polar and a medium-polar column set.
Cristiane S. Schwalm; Marco Antonio Ceschi; Dennis RussowskyHow to cite this article
Metal halide hydrates are efficient catalysts to the Conjugate Friedel-Crafts reaction (CFC) of Indoles and activated olefins in alcoholic media. Solvent-free conditions were successful applied to prepare nitro-adducts and b-carbolines in good yields in an environmentally-friend protocol.
Rodrigo A. Cormanich; Matheus P. Freitas; Roberto RittnerHow to cite this article
QSAR based on 2D chemical images (MIA-QSAR) shows that bidimensional structures correlate with biological activities, and is a promising tool for the design of new antimalarial compounds, with modeling capability comparable to well established 3D approaches.
Ana C. Aguiar; Solange M. Cottica; Marcela Boroski; Cláudio C. Oliveira; Elton G. Bonafé; Polyana B. França; Nilson E. Souza; Jesui V. VisentainerHow to cite this article
The fatty acid methyl esters (FAME) were prepared by methylation of the total lipids (TL) and separated by gas chromatography using as parameter the equivalent chain-length values (ECL) in the identification and flame Ionization detector response factors in the quantification.
Jinzhang Gao; Xiaodong Chen Jie Ren; Wu YangHow to cite this article
Figure A shows a regular oscillator being translating gradually into a non-equilibrium stationary state. Figure B shows a bifurcation point.
Leonardo Luiz Okumura; Adelir Aparecida Saczk; Marcelo Firmino de Oliveira; Ana Carolina C. Fulgêncio; Larissa Torrezani; Paulo Eduardo N. Gomes; Rosana M. PeixotoHow to cite this article
SWV optimized responses for different MP concentrations in supporting electrolyte 0.20 mol L-1 acetate buffer pH 5.2 and volume of graphite suspension as a modifier of 10 mL. Inset: calibration curve for MP.
Natália M. L. Silva; Carlos B. Pinheiro; Eluzir P. Chacon; Jackson A. L. C. Resende; José Walkimar de M. Carneiro; Tatiana L. Fernández; Marciela Scarpellini; Mauricio LanznasterHow to cite this article
The complexes [VO2(L)] and [VO2(HLox)] were synthesized by the reaction of [VO(acac)2] with the ligands HL and H2Lox, respectively. Alternatively, [VO2(HLox)] was also obtained by the reaction of HL with [VO(acac)2] and hydroxylamine, or reacting [VO2(L)] with hydroxylamine.
Otaciro R. Nascimento; Lia M. B. Napolitano; María H. Torre; Octavio Peña; Rafael CalvoHow to cite this article
In the GA we are showing the EPR line variation with temperature of single-crystal [Cu2(flu)4(dmf)2] compound and magnetic susceptibility versus temperature extracted from this measurements.
Helena Stecka; Pawel PohlHow to cite this article
A procedure based on solid phase extraction with a strongly acidic cation-exchanger Dowex 50W×
8-200 was proposed to pre-concentrate and determine ultra-traces of Li in floral honeys. It enabled to determine from 0.4 to 5.3 ng g-1 of Li with precision being within 8-11%.
Abolghasem Jouyban; Mohammad A. A. Fakhree; Ali Shayanfar; Taravat GhafourianHow to cite this article
The Catalan solvent parameters were used to develop a new set of solute parameters. The developed solute parameters were used to propose a novel model for predicting aqueous solubility of solutes. The Catalan solvent parameters were employed to develop models for representing a number of physico-chemical properties of the solvents.
Magali Salas-Reyes; Javier Hernández; Zaira Domínguez; Felipe J. González; Pablo D. Astudillo; Rosa Elena Navarro; Evelin Martínez-Benavidez; Carlos Velázquez-Contreras; Samuel Cruz-SánchezHow to cite this article
The electrochemical oxidation of a series of caffeic and ferulic acids derivatives as well as their corresponding redox moieties catechol and guaiacol was studied as a function of the structure in aprotic medium.
Luís Fernando Cabeça; Armando Mateus Pomini; Pedro Luiz R. Cruz; Anita J. MarsaioliHow to cite this article
Upper Figure: Saturation of a liposome 1H NMR signal transferred to the complex liposome-homoserine lactone (HSL)and dissociation produce free homoserine lactone with saturated hydrogens. Lower Figure: First binding events of the quorum sensing phenomenum showing the HSL diffusing through the bacterium membrane.
Zoran Simi; Zorka D. Stani; Milan AntonijeviHow to cite this article
In the course of the coulometric determinations of acids (bases) in non-aqueous solvents (AN and PN), the electrochemical generation of lyate (hydrogen) ions is performed by the reduction (oxidation) of an appropriate electroreactive compounds. The natural minerals pyrite (FeS2) and chalcopyrite (CuFeS2) have been used as the indicator electrodes.
Luciano E. Fraga; Maria Valnice B. ZanoniHow to cite this article
This image shows UV-Vis spectra and the present total color removal after 120 min of the 1.0 x10-5 mol L-1 basic red solution when treated by photoelectrocatalytic oxidation using both systems of irradiation (visible and ultraviolet) obtained before and after 120 min.
Vagner B. dos Santos; Thiago B. Guerreiro; Willian T. Suarez; Ronaldo C. Faria; Orlando Fatibello-FilhoHow to cite this article
Low-cost portable microcontrolled nephelometer. a) Picture of the nephelometer developed; b) Schematic diagram of the optical compartment showing the blue LED and photodiode TSLB257 at 90º and infrared LED and TSL260R-LF at 90º.
José Alberto Fracassi da Silva; Ariane Deblire; Dosil P. de Jesus; Wendell Karlos T. ColtroHow to cite this article
In this article we demonstrate how to use an inexpensive instrumentation based on visible-high intensity LED and microscope for the determination of the electroosmotic flow in microseparation devices.
Carlos Chaverri; Cecilia Díaz; José F. CiccióHow to cite this article
Morphology of Ocotea morae (Lauraceae) and structural formulas of major constituents from leaves (b-pinene), bark (1,8-cineole) and wood [(E)-nerolidol] essential oils.
Palaniappan Abirama Sundari; Paramasivam ManisankarHow to cite this article
We demonstrate the fabrication of nanosize poly(3-methyl thiophene) (P3MT)/ multiwalled carbon nanotubes (MWCNTs) modified glassy carbon (GCE) electrode for the sensitive determination of some common pesticides.
Alexander M. Silva; Clarissa O. da Silva; André G. H. Barbosa; Rosane A. Fontes; Sergio Pinheiro; Marco Edilson F. Lima; Rosane N. CastroHow to cite this article
Two possible mechanisms for the 1,4-asymmetric induction in the stereoselective addition of (R)-pantolactone to 2-phenylpropylketene.
Éric de S. Gil; Diogo D. Cordeiro; Ana E. B. Matias; Sílvia H. P. SerranoHow to cite this article
Voltammograms and the analytical curve obtained at glassy carbon electrode in 0.1 mol L-1 phosphate buffer solution, pH 8.0 obtained at glassy carbon electrode for blank and fluconazole solutions.
Vanda P. Lemos; Antônio R. de Oliveira Meireles; Kelly das Graças Fernandes; Milena C. de Moraes; Marcondes L. da Costa; Any K. Terra Silva; Dirse C. KernHow to cite this article
Trend of the concentrations of Mg, Ca, P and organic matter in archaeological black earth (ABE) at the site Ilha de Terra from Caxiuanã suggests placeholders as cemetery, religious ceremonies and food preparations by ancient inhabitants of this site.
Tzi-Yi Wu; Ming-Hsiu Tsao; Shyh-Gang Su; H. Paul Wang; Yuan-Chung Lin; Fu-Lin Chen; Cheng-Wen Chang; I-Wen SunHow to cite this article
Organic dyes comprising carbazole, iminodibenzyl and phenothiazine moieties, respectively, as the electron donors and di-anchoring rhodanine rings as the electron acceptors are synthesized and evaluated for use in dye-sensitized solar cells. Solar cells employing these organic dyes show good overall conversion efficiency (up to 4.91%).
Guillermo J. Copello; Rodolfo E. Garibotti; Florencia Varela; María V. Tuttolomondo; Luis E. DiazHow to cite this article
Exhausted yerba mate leaves (Ilex paraguariensis) demonstrated to effectively adsorb metals from aqueous solutions, such as Cr(VI), which suggest the applicability of this cost effective biosorbent.
Mirelly D. F. Santos; José T. Litivack-Junior; Roberto V. Antunes; Tania M. S. Silva; Celso A. CamaraHow to cite this article
In this reaction substituted phenazines are formed by the neat reaction of alkylamines with lapachol, and in the figure the nitrogens are painted in blue to emphazise that one of the ring is originated from a Strecker degradation reaction.
Rodrigo R. Catharino; Renato Haddad; Helena T. Godoy; Marcos N. Eberlin; Leonardo S. SantosHow to cite this article
Direct infusion ESI-MS/MS in the negative ion mode using SRM (m/z 124 -> m/z 80) was applied with high confidence, speed and selectivity to quantifty taurine in energetic drinks.
Renan A. S. Pirolla; Paulo A. Baldasso; Sérgio Marangoni; Paulo J. S. Moran; José Augusto R. RodriguesHow to cite this article
Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
JBCS Editorial and Publishing Office
University of Campinas - UNICAMP
13083-970 Campinas-SP, Brazil